本帖最后由 UerRob 于 2015-1-22 11:00 编辑
用的mega2560 只有一个SDA和SCL 所以打算改变传感器的地址来挂载多个器件。
ADXL345 I2C通信的时候不是可以用SD0口的置高低电平在两个地址中选择吗..
不过我试了给它置高电平和低电平,不过一直都是在同一个地址0x53上可以正常通信。
将代码中地址换为0x1D无论高低电平都无法正常获取数据了。
我用地址扫描检测无论高低地址都是0x53
地址扫描代码:http://www.geek-workshop.com/thread-287-1-1.html
结果:
代码
- //I2C (sparkfun breakout)
- #define Register_ID 0
- #define Register_2D 0x2D
- #define Register_X0 0x32
- #define Register_X1 0x33
- #define Register_Y0 0x34
- #define Register_Y1 0x35
- #define Register_Z0 0x36
- #define Register_Z1 0x37
- #include <Wire.h>
- int ADXAddress = 0x53; // the default 7-bit slave address
- int reading = 0;
- int val=0;
- int X0,X1,X_out;
- int Y0,Y1,Y_out;
- int Z1,Z0,Z_out;
- double Xg,Yg,Zg;
- void setup()
- {
- Wire.begin();
- Serial.begin(9600);
- delay(100);
- // enable to measute g data
- Wire.beginTransmission(ADXAddress);
- Wire.write(Register_2D);
- Wire.write(8); //measuring enable
- Wire.endTransmission(); // stop transmitting
- }
- void loop()
- {
- //--------------X
- Wire.beginTransmission(ADXAddress); // transmit to device
- Wire.write(Register_X0);
- Wire.write(Register_X1);
- Wire.endTransmission();
- Wire.requestFrom(ADXAddress,2);
- if(Wire.available()<=2)
- {
- X0 = Wire.read();
- X1 = Wire.read();
- X1=X1<<8;
- X_out=X0+X1;
- }
- //------------------Y
- Wire.beginTransmission(ADXAddress); // transmit to device
- Wire.write(Register_Y0);
- Wire.write(Register_Y1);
- Wire.endTransmission();
- Wire.requestFrom(ADXAddress,2);
- if(Wire.available()<=2)
- {
- Y0 = Wire.read();
- Y1 = Wire.read();
- Y1=Y1<<8;
- Y_out=Y0+Y1;
- }
- //------------------Z
- Wire.beginTransmission(ADXAddress); // transmit to device
- Wire.write(Register_Z0);
- Wire.write(Register_Z1);
- Wire.endTransmission();
- Wire.requestFrom(ADXAddress,2);
- if(Wire.available()<=2)
- {
- Z0 = Wire.read();
- Z1 = Wire.read();
- Z1=Z1<<8;
- Z_out=Z0+Z1;
- }
- //----------------
- Xg=X_out/256.0;
- Yg=Y_out/256.0;
- Zg=Z_out/256.0;
- Serial.print("X= ");
- Serial.print(Xg);
- Serial.print(" ");
- Serial.print("Y= ");
- Serial.print(Yg);
- Serial.print(" ");
- Serial.print("Z= ");
- Serial.print(Zg);
- Serial.println(" ");
- //==================
- delay(200);
- }
复制代码
谁遇到过...感激不尽 |